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MAGNETIC BRUSH CLEANING SYSTEM

IP.com Disclosure Number: IPCOM000024886D
Original Publication Date: 1982-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 82K

Publishing Venue

Xerox Disclosure Journal

Abstract

In electrophotographic printing machines, it is desirable to automatically reclaim toner particles and return the same to the development system for subsequent recycling. To avoid degradation of copy quality, it is necessary to insure that the reclaimed toner is free from contaminants, such as paper fibers, kaolin particles and the like. It has been found that these contaminants carry a "wrong sign" charge and, hence, transport toner particles which develop out in background regions.

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XEROX DIĀ§CLOSURE JOURNAL

MAGNETIC BRUSH CLEANING SYSTEM Proposed Classification

                                 U.S. Cl. 355/3
Laing R. John Int. Cl. G03g 15/00

In electrophotographic printing machines, it is desirable to automatically reclaim toner particles and return the same to the development system for subsequent recycling. To avoid degradation of copy quality, it is necessary to insure that the reclaimed toner is free from contaminants, such as paper fibers, kaolin particles and the like. It has been found that these contaminants carry a "wrong sign" charge and, hence, transport toner particles which develop out in background regions.

This problem is alleviated by the cleaner system shown in the figure. In conventional fashion, captive magnetic .brush assembly 10 rotates in the direction of arrow 12 to remove residual toner particles and contaminants from the surface of photoconductor 20 and into contact with a first detoning roll 30. Suitable biasing maintains a. "right sign" charge (e.g., positive) on the surface of first detoning roll 30 which is the same as the charge on the toner particles and opposite

Volume 7 Number 4 July/August 1982 26 1

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MAGNETIC BRUSH CLEANING SYSTEM (Contld)

to the "wrong sign'! charge (e.g., negative) carried by the contaminants. The first detoning roll 30 thus functions to remove the charged contaminants and a small amount of toner. These materials are removed from the rotating detoning rol...